The PX3544 Graphics Processor Digital Multiphase
Controller provides core power for today’s high current
graphic processors by driving up to four synchronousrectified
buck-converter channels in parallel. Interleaved
timing of the channels results in a higher ripple
frequency, reducing input and output ripple. With up to
four phases, each capable of up to 2 MHz operation, the
PX3544 can be used to build DC-DC converters that
provide up to 130A with excellent efficiency, low ripple,
and the lowest component count.
The PX3544 utilizes digital technology to implement all
control functions, providing the ultimate in flexibility and
stability. The PX3544 incorporates an industry standard
I2C-bus serial interface for control and monitoring.
Through the serial interface, the power supply designer
can quickly optimize designs and monitor system
performance. The interface allows the PX3544 to provide
digitized information for real time system monitoring and
control.
The PX3544 provides intelligent phase detection capability
allowing the system to operate under the condition of up to
2 (of 3) missing 12V supplies. Autonomous phase control
circuitry will drop phases due to current balance or 12V
faults and add phases when the 12V supply returns. An
I2C based user phase control mode is also provided.